Amplitude modulation with time- and spectrum-shared sidebands

Details Amplitude modulation with time- and spectrum-shared sidebands Amplitude modulation with time- and spectrum-shared sidebands

2006-03-21

2006-03-21

Nguyen, Duc (Department: 2643)

Telecommunications

Transmitter

Amplitude modulation

C455S203000, C455S204000, C375S300000, C375S301000, C375S320000, C375S321000, C332S149000, C332S170000

Reexamination Certificate

active

07016659

ABSTRACT:
In an AM system directed to commercial broadcasting, a pure unmodulated (CW) carrier signal and two sideband signals are generated and processed separately as three independent signals that are summed as output of a final linear mixer. The sideband signals are derived independently utilizing audio spectrum-sharing based on complementary comb filtering, quadrature phase-shifting at both audio and carrier sideband frequencies, and exclusive alternate toggling at a designated switching rate between the two sidebands so that at any instant in time only one of the two sidebands is present along with the continuous carrier. The overall performance provides the capability of advantageous modulation beyond the conventional 100% modulation limit.

REFERENCES:
patent: 4569073 (1986-02-01), Kahn
patent: 4850020 (1989-07-01), Kahn
patent: 5097218 (1992-03-01), Cooper

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